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  • 1.
    Anders, Berntson
    et al.
    Chalmers University of Technology, Sweden.
    Anderson, D.
    Chalmers University of Technology, Sweden.
    Lisak, M.
    Chalmers University of Technology, Sweden.
    Quiroga-Teixeiro, M. L.
    Chalmers University of Technology, Sweden.
    Karlsson, M.
    Chalmers University of Technology, Sweden.
    Self-phase modulation in dispersion compensated optical fibre transmission systems1996In: Optics Communications, ISSN 0030-4018, E-ISSN 1873-0310, Vol. 130, no 1-3, p. 153-162Article in journal (Refereed)
    Abstract [en]

    An analysis is made of the influence of self-phase modulation on optical fibre communication systems where the chromatic dispersion is compensated for by a dispersion compensation fibre. In particular we derive a simple and useful expression for the optimal fibre length in the presence of nonlinearities.

  • 2. deMatos, C J S
    et al.
    Margulis, W
    RISE, Swedish ICT, Acreo.
    Optical fibre modulator based on electrostatic attraction2001In: Optics Communications, ISSN 0030-4018, E-ISSN 1873-0310, Vol. 190, no 1, p. 135-Article in journal (Refereed)
  • 3. Lebedev, A
    et al.
    Vegas Olmos, JJ
    Pang, Xiaodan
    RISE, Swedish ICT, Acreo.
    Tafur Monroy, I
    Larsen, K
    Forchhammer, S
    Low complexity source channel coding for mm-wave hybrid fiber-wireless links2014In: Optics Communications, ISSN 0030-4018, E-ISSN 1873-0310, Vol. 318, p. 142-Article in journal (Refereed)
  • 4.
    Petermann, Ingemar
    et al.
    RISE, Swedish ICT, Acreo.
    Helmfrid, S
    Friberg, A T
    Limitations of the interferometric side diffraction technique for fibre Bragg grating characterization2002In: Optics Communications, ISSN 0030-4018, E-ISSN 1873-0310, Vol. 201, no 4, p. 301-Article in journal (Refereed)
  • 5. Wang, K
    et al.
    Li, J
    Djupsjöbacka, Anders
    RISE, Swedish ICT, Acreo.
    Popov, S
    Jacobsen, G
    RISE, Swedish ICT, Acreo.
    Makon, RE
    Driad, R
    Walcher, H
    Rosenzweig, J
    Steffan, AG
    Mekonnen, GG
    Bach, H-G
    Li, Z
    Friberg, AT
    100 Gb/s RZ-OOK transmission through 212 km deployed SSMF using monolithically integrated ETDM receiver module2011In: Optics Communications, ISSN 0030-4018, E-ISSN 1873-0310, Vol. 284, p. 782-86Article in journal (Refereed)
  • 6. Xu, T
    et al.
    Jacobsen, G
    RISE, Swedish ICT, Acreo.
    Popov, S
    Li, J
    RISE, Swedish ICT, Acreo.
    Wang, K
    Friberg, A T
    Normalized LMS digital filter for chromatic dispersion equalization in 112-Gbit/s, PDM-QPSK coherent optical transmission system2010In: Optics Communications, ISSN 0030-4018, E-ISSN 1873-0310, Vol. 283, p. 963-7Article in journal (Refereed)
  • 7.
    Xu, Tianhua
    et al.
    Tianjin University, China; University College London, UK; KTH Royal Institute of Technology, Sweden.
    Jacobsen, Gunnar
    RISE, Swedish ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Li, Jie
    RISE, Swedish ICT, Acreo.
    Sergeyev, Sergey
    Aston University, UK.
    Friberg, Ari T.
    KTH Royal Institute of Technology, Sweden.
    Zhang, Yimo
    Tianjin University, China.
    Analytical BER performance in differential n-PSK coherent transmission system influenced by equalization enhanced phase noise2015In: Optics Communications, ISSN 0030-4018, E-ISSN 1873-0310, Vol. 334, p. 222-227Article in journal (Refereed)
    Abstract [en]

    Long-haul high speed optical transmission systems are significantly distorted by the interplay between the electronic chromatic dispersion (CD) equalization and the local oscillator (LO) laser phase noise, which leads to an effect of equalization enhanced phase noise (EEPN). The EEPN degrades the performance of optical communication systems severely with the increment of fiber dispersion, LO laser linewidth, symbol rate, and modulation format. In this paper, we present an analytical model for evaluating the performance of bit-error-rate (BER) versus signal-to-noise ratio (SNR) in the n-level phase shift keying (n-PSK) coherent transmission system employing differential carrier phase estimation (CPE), where the influence of EEPN is considered. Theoretical results based on this model have been investigated for the differential quadrature phase shift keying (DQPSK), the differential 8-PSK (D8PSK), and the differential 16-PSK (D16PSK) coherent transmission systems. The influence of EEPN on the BER performance in term of the fiber dispersion, the LO phase noise, the symbol rate, and the modulation format are analyzed in detail. The BER behaviors based on this analytical model achieve a good agreement with previously reported BER floors influenced by EEPN. Further simulations have also been carried out in the differential CPE considering EEPN. The results indicate that this analytical model can give an accurate prediction for the DQPSK system, and a leading-order approximation for the D8PSK and the D16PSK systems.

  • 8.
    Xu, Tianhua
    et al.
    RISE, Swedish ICT, Acreo. KTH Royal Institute of Technology, Sweden; Tianjin University, China.
    Jacobsen, Gunnar
    RISE, Swedish ICT, Acreo.
    Popov, Sergei Yu
    KTH Royal Institute of Technology, Sweden.
    Li, Jie
    RISE, Swedish ICT, Acreo.
    Friberg, Ari T.
    KTH Royal Institute of Technology, Sweden.
    Zhang, Yimo
    Tianjin University, China.
    Carrier phase estimation methods in coherent transmission systems influenced by equalization enhanced phase noise2013In: Optics Communications, ISSN 0030-4018, E-ISSN 1873-0310, Vol. 293, p. 54-60Article in journal (Refereed)
    Abstract [en]

    We present a comparative study on three carrier phase estimation algorithms, including a one-tap normalized least mean square (NLMS) method, a block-average method, and a Viterbi-Viterbi method in the n-level phase shift keying coherent transmission systems considering the equalization enhanced phase noise (EEPN). In these carrier phase estimation methods, the theoretical bit-error-rate floors based on traditional leading-order Taylor expansion are compared to the practical simulation results, and the tolerable total effective linewidths (involving the transmitter, the local oscillator lasers and the EEPN) for a fixed bit-error-rate floor are evaluated with different block sizes, when the fiber nonlinearities are neglected. The complexity of the three carrier phase estimation methods is also discussed. We find that the carrier phase estimation methods in practical systems should be analyzed based on the simulation results rather than the traditional theoretical predictions, when large EEPN is involved. The one-tap NLMS method can always show an acceptable behavior, while the step size is complicated to optimize. The block-average method is efficient to implement, but it behaves unsatisfactorily when using a large block size. The Viterbi-Viterbi method can show a small improvement compared to the block-average method, while it requires more computational complexity.

  • 9.
    Xu, Tianhua
    et al.
    Tianjin University, China; University College London, UK; KTH Royal Institute of Technology, Sweden.
    Li, Jie
    RISE, Swedish ICT, Acreo.
    Jacobsen, Gunnar
    RISE, Swedish ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Djupsjöbacka, Anders
    RISE, Swedish ICT, Acreo.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Zhang, Yimo
    RISE, Swedish ICT, Acreo.
    Bayvel, Polina
    University College London, UK.
    Field trial over 820km installed SSMF its potential Terabit/s super channel application with up to 57.5-Gbaud DP-QPSK transmission2015In: Optics Communications, ISSN 0030-4018, E-ISSN 1873-0310, Vol. 353, p. 133-138Article in journal (Refereed)
    Abstract [en]

    In this paper, we report the result of a field trial of 56-Gbaud (224-Gbit/s) and 57.5-Gbaud (230-Gbit/s) dual-polarization quadrature phase shift keying (DP-QPSK) coherent optical transmission over 820 km installed standard single mode fiber (SSMF). Offline digital signal processing (DSP) was applied for signal recovery and bit-error-rate (BER) counting in our field trial experiments, and BER performance well below the 7% overhead hard-decision forward error correction (FEC) error-free threshold (4.5×10−3) at 231-1 pseudo random bit sequence (PRBS) pattern length has been achieved, with the best achievable BERs of 2×10−4 (56-Gbaud) and 3×10−4 (57.5-Gbaud), respectively. In parallel a 1.15-Tbit/s (5×230-Gbit/s) quasi-Nyquist spaced wavelength division multiplexing (WDM) superchannel transmission over the same 820 km optical field link (FL) was also investigated through numerical simulations based on the same 57.5-Gbaud DP-QPSK signal using 1% roll-off Nyquist pulse shaping with 60-GHz channel spacing, and the results indicate that the BER performance well below the 7% overhead hard-decision FEC error-free threshold (4.5×10−3) for the 1.15-Tbit/s DP-QPSK superchannel transmission can be achieved.

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